The "Facebook phone" is here and, as expected, it is not a phone built by Facebook. Instead, the company unveiled "Facebook Home," a download that converts an Android phone into a Facebook-centric device, reports CNET. It will be available on a limited basis April 12 at the Google Play store. That's the same day HTC is rolling out its HTC First, the first phone to ship with Facebook Home in place. (It will run $99 with a two-year contract from AT&T, reports TechCrunch.) "We're not building a phone and we're not building an operating system," says CEO Mark Zuckerberg. "We're building something a whole lot deeper than an ordinary app."